. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. THE GENUS DENDROCTONUS. 101 Forest, Colorado; Fredonia, Ariz.; Kanab, Escalante, Provo, Aqua- rius National Forest, Utah, and at Keystone, Wyo. It is repre- sented in the forest-insect collection of the Bureau of Entomology by more than 10,000 specimens. BIBLIOGRAPHY. Hopkins, 19026, p. 10; Hopkins, 1902c, p. 21; Hopkins, 1903a, p. 59; Hopkins, 19036, pp. 275-282; Hopkins, 1904, pp. 41, 43, 44; Hopkins, 1905, pp. 1-24; Hopkins, 1906; p. 4; Hopkins, 1907, p. 162; Hopkins, 1909, pp. 109-114. No. 11. THE JEFFREY PIN
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. THE GENUS DENDROCTONUS. 101 Forest, Colorado; Fredonia, Ariz.; Kanab, Escalante, Provo, Aqua- rius National Forest, Utah, and at Keystone, Wyo. It is repre- sented in the forest-insect collection of the Bureau of Entomology by more than 10,000 specimens. BIBLIOGRAPHY. Hopkins, 19026, p. 10; Hopkins, 1902c, p. 21; Hopkins, 1903a, p. 59; Hopkins, 19036, pp. 275-282; Hopkins, 1904, pp. 41, 43, 44; Hopkins, 1905, pp. 1-24; Hopkins, 1906; p. 4; Hopkins, 1907, p. 162; Hopkins, 1909, pp. 109-114. No. 11. THE JEFFREY PINE BEETLE. (Dendroctonus jeff'reyi Hopk. Figs. 60, 61.) The Jeffrey pine beetle is a stout, black, cylindrical barkbeetle 6 to 8 mm. in length; the head broad, convex, with faint grooves behind and usually in front of the mid- dle; the prothorax stout, broad, shining, the sides suddenly nar- rowed toward the head and the punctures fine; the elytra with mod- erately coarse rugosities between the rows of punctures, which are distinct on sides, the declivity with a few long hairs, the striae on grooves narrow, and the interven- ing spaces broad and roughened with coarse granules. (See fig. 60.) It attacks living and dying Jeffrey pine and yellow pine, in the Yosemite National Park and San Bernardino County, California. It excavates long, nearly straight, egg galleries through the inner bark, and grooves the surface of the wood; the larval mines extend from the sides, exposed in the inner bark. The stout, whitish, grublike larvae trans- form to pupae and adults in cells at the end of the burrows, and the broods occupy the bark on the main trunk. The infested trees are indicated by pitch tubes on the trunks in the summer and fall, and during the following May to August by the fading and yellowish Fig. 60.—The Jeffrey pine beetle (Dendroctonus jeffreyi): Adult. Greatly enlarged. (Au- thor's illustration.). Please note that these images are extracted from scanned page image
Size: 1195px × 2091px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectentomology
